Grace has agreed to marry Sir Harcourt in return for his financial support of her family. At a house party in her father's place, Harcourt's son Charles also falls in love with Grace. When his father appears on the scene, he has to convince him that there is a case of mistaken identity and he is somebody else. Then Lady Gay Spanker, a married woman also visiting at the house, is persuaded by Charles to seduce his father and thus divert his attention from Grace. Much confusion and scheming ensues.

Comedy

National Theatre Live: London Assurance (2010) is currently not available on any services.